Are you letting it dry between coats of "paint"? That would help reduce the streaks. HTH
Just until it doesn't have that tacky or sticky kind of feeling. It usually doesn't take that long to achieve it. Did you start out with a colored fondant or white? Usually a few coats is all it needs if you dry it well in between. Maybe 20-30 minutes depending on how wet each coat is. Sometimes you can use a clowdryer on a cool/no heat setting can help you work faster.
Just wondering how it went. Hope to see a picture later!
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